I have exactly the same issue. I switched off colors changing and keyboard is just backlit with one color. Seems to make it last longer before it will crash. Happens few times a day. Funnily, my son is using keyboard on PS4 from time to time and he never experienced this issue.
Also, I am on
Model Name: MacBook Pro
Model Identifier: MacBookPro11,3
Processor Name: Intel Core i7
Processor Speed: 2.3 GHz
System Version: macOS 10.13.6 (17G6030)
Kernel Version: Darwin 17.7.0